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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0404d7bf87c7d660ecb1b31a4a269f66e91841a2a5e0906f2437e5d1649bf4d8' 
  AND token = 'n/za1W3w6PFQwv2PXsQ6Fj/775AMZdR5tazXR7faWTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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