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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbc182e5d203a0be51aaf4c764c80a1811584843562c08c092613546e55d6ec' 
  AND token = '4RHZ5Gn8xz3smxvJfm1K9fVF+5IDvzzn5Pe8KLDylnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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