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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2734139e567c7d6b9e68c48fa9f843042887e55ceb59d0d5b4e72de7f52f8151' 
  AND token = 'K2nSg74/KxUnbH3O0dbU2erJaghEq77zagroDJMnEK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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