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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b085df95dd51f782599dce40f95795894cbbd707674540bfc748a3b910a077e9' 
  AND token = 'yuTk9wZjWCeCX4HbqX/bBe566tPtK+Xso6VuRcqMAjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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