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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38dd8631337cb32f1357bfd372ca8a12dcfe48b76593ec4a2c5e0780e6e2aa55' 
  AND token = 'DlJpr1y4i2iBbi5ph04B2pa4IeK7trTHR75aIggVydM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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