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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba02128d90a42f4c3265488586550a849b46e1a993b562cd8c85b4045644183e' 
  AND token = 'J4T5dhClPq/bkUr8JE2ZzPpGG2RrCGk7tFxmgXwN+qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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