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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc503234eccbf53a53781c65e5aa3d318be7a9f377bf099c1dfa0bd282e14a7' 
  AND token = '0DGauHL+c/9JYTzY1s8fIkiQ4jxRbeteQ/X9eQfnPLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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