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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4caad1ad39e931fdd6e18c610528a144ef6907a9c74cbb113c4f4f2968169857' 
  AND token = 'sJvFHfad4ZR2TuLRSUc/hl38V4JcsEQm12mNb0xA1ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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