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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383831ed50483440badde3d3379d68ed49c827e93d47a1d34b3048e2979a8754' 
  AND token = 'jShfJZ1f58pSwZwl51CNlOISARSxhD0H8NV1ivm8+JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00296

JSON explain

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