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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efdd68a182fd38af790f5964979c4549400bea2f58563c913bb3737f3e55ffa' 
  AND token = '52v4PTDyyaG8Xzuh3y7NZ5NUNbzf2BfmarVhFHKzkNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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