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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c228de251a83d3476a57435e60c397b5cbbe46a9f87f95e2d0e8e1e568d3761a' 
  AND token = 'tCHwfXCH4XjrETi/Eb6WeXHJztA9LIhko0mif6Q/AYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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