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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c247f54aa36dd2310367b9d3b715e9b39e2a3b0f401a83de5e8f032af800b05b' 
  AND token = 'TTztqN5WLc4mBxd2SBe9fNANDyYnv+hCsSqkxhDEGAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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