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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e984f3b97049a4b0d6d26d875708e7f36dce4976184e4f49a4cefc324eaae9a' 
  AND token = 've/e3kH5TGsUcf0ILpOG4r/YJe8LUG3veHalc9kieTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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