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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c3a34ca2ef78b87ba9fa6192cf8ca8492312eaf2230c05027339534b305696' 
  AND token = '6+f8MKgHZA0Zdx6L5nA4VwB7AXoQD03/O1E7Bt9btkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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