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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f86d6f38a29c40cf1e239c63ec3c0a28af07d0517a8cf9d504eed7deb51788' 
  AND token = 'rTwkxRTGftNZzJOqFFHJuIXXFXFcxEUVU7WJQN2XZp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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