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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2cff827c3fec3c725ca97af636ffe28e433860e3a266e81a27373811d41d459' 
  AND token = '/cZwVYt2ixtFOo2qpNkd05sdTQxf7qCABn3sMtJXBdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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