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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f0396f1b5fcace58b7bd92227c7b592e7d51c574ef630b420b250fe5336bdd' 
  AND token = 'R7wsf7vohvnDQvp9O0OwAXJpme8P5c5I2L2NmUldMCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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