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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b431dbd8b72870dbbd6a200b6112719c82b93663da139a82ad8fcfbe6a590bad' 
  AND token = '0PjNvXnIbtxNfQDAtUyajplgqjR7HYCDnCRpiqHGSSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}