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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca2adf0f3a8abe10725831fda1c78dfb05f353e6154a8ada0a86137596efa2e5' 
  AND token = 'Tmmnz8QMPbqDejxG9XQSVxZyRd1ZjOxbpNHJ5+IF1bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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