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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c42b66d65a6dcfed9c5f4781e4c0954d68e346f91ed503dd6a2b9812a6e6fa' 
  AND token = '8/RUCTvwfZ877mnGBsROTmEyaIryh9677q+1AGtKGts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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