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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7236f70b96a183c90ccc74717e43fcb30636e5dc69f3653ab1a46131c964f214' 
  AND token = 'mfH6effRbVOG4L7J/cb4OskYv4GUhF7bZ4HqZxv/vR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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