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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb0d32c970e83585928cad55c2c1114ce3320e7da7799ebfeb6d5c8176ecb4a' 
  AND token = 'kqy/mKN2V+VaXR4GLoNmg7VomQz/f3gCew8ISpH+Iwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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