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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e88be1ddc5b1c2e550266d2f750b39f20574c170864b86f1c5fe56bdedee9aa1' 
  AND token = '2Rtvimb9Hqb19ipvEBTwoqyq9NfZMe+U8gpxdcQqHSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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