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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd190d044c0aad05e099904252525a4660f31e1d982614df51bf5b657296d0f05' 
  AND token = '6y+Z9mMNlV11eqeD9Cbfmym72aR1rQNUM2n4rCtU/+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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