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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e83826d57ce5aa2a2828fc158f6dc3f6ebde38a0cc2e2dcf66624bad2deff85' 
  AND token = 'mid4Anx0nHuzm7/QiKs23+6yR1ko/d/ZsP4ULPYWEGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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