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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8effe8066c62b1fdef60eb73dad1d85a595b9e5b1c688377baf3c45ecd84f2' 
  AND token = 'LRmDci58393fTCs935pI93wBSOyzFfClURAPrSHkocM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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