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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab57e83706d5bccdd0175f720ace806da5e46c3e8cc9aab9ceadf49ffdbc6721' 
  AND token = 'vA9LigLH2uG32PtXzBg31knDrkWbprgCuvrn4AHQCpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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