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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7205f9b3a04b93f5ca607246debb3e4a8b5e92fca7ad6f6d164aa5f67f3af4' 
  AND token = 'WYxqSI0lDzhkGKqzASsgbnegXzdTucx4ooYJ8KOtTUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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