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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b83748b97427f9825e54ee22460c2e7979c8e7591484f395c3a937ec3dd3a46' 
  AND token = 'cvBinY1NKy/R7nk17EHa1Gvejo2YZKifavAPkFiRdkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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