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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7817183f0739156d276e8fb3e7af85f486fa9a1643cc2df3efd5d0303b84e1' 
  AND token = 'yXJIGHpXrYLEfBV9r8ug66lahroUgpR0SqwlEqeSBqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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