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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763079efc1cdf3a4ec182bd3e7aa9eb0994894c060d523a699baf27d151bed8b' 
  AND token = 'vKC+EQ7mHZHl2ZXze4vMdLxGuotIsP8ArH/abPnYbFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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