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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6929617f961a1eb7de92ee2267d7cf73cad11acc83e53f6b6e737e535c4a8a7' 
  AND token = 'L7PFDx0tt06MHKTUavTSSamDcEdDXeRMUHM13/HfjYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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