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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c7fc5beae8a480e7db373174008c958deec6269facc5d61f7be729d9e36bbb' 
  AND token = 'u+bgD+V/JXoGfJmxweq1UmsuQbR/N49Sc1vB26C02Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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