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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0827a96f887528d87347396465c196896623daca6a15be5de5f8d9c2ff70c3' 
  AND token = 'xAHUMwaC0tKexLVTn/0uVwo5KUhjxXs0kN1PBvdnI64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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