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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b93b1d7e23cfde71812199546fc892e19070e6425bd8ecddaa2525a218c4d97' 
  AND token = 'uiBV2N72wGDqjcDh/Z4iWzWp2EROlTzf0cyeRm8EKvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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