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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ff3bcf6be4583ebffa9f20ca16650e52721a2fb9a93fccf8eafd58b1312d36' 
  AND token = 'bi+fvDER+pwj7ac2OlNj0yPO6EQmzaSIyDRw96oBPqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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