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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335e73782b04bd10b9e393837e5041b945746a62cca0853920c90f25fa1cbd79' 
  AND token = 'k3+lrqai/4MKylky0SFJs3l2ZTRRCLIHrimpZHnP4IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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