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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432c2f7c8c59c903692a7dfedaab7bc99442d7d057596daaa24027098b50ac1a' 
  AND token = 'gAWYurunzB+D+pEBN73Kwn4EFLgzUmB9dunggPbi274=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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