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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61879946ba2d88d0b89111ff92e9f3ee62eb769f048c7efdcbd9f95501d75db' 
  AND token = 'zTC6/v495cieIFSFixvbHB82iN/Xp/fHFCAB7In+XCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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