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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5a017c70108ee6dccdd3b17ca3fe5b1e30340550c460da895a4f6402b85692' 
  AND token = 'NcucRaVKjV8vVho8KPu+LPfQpAIO5limImwcbg2rhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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