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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c8395a0aa4e0227d8f4ef291584df46f8ef5aca3c52cfd4eed7614d6058e7f' 
  AND token = '1zLefqaTJb1px9JwEpG4+1j0QAdSm9PJ7Y+lIvEN8vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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