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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad40b17db1e4ff73d7bc2e6534d203ed1bc5cb48f6049b0147ce5b995eb1137a' 
  AND token = '+pQ6G1sIwtCoP6IeQ6hcokmEE2lsqIq/FFSq1ZYNaxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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