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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369bfcecddcd8eafbf95183b2454799d71ce5421ae7a043da13e318dbb19d5dd' 
  AND token = 'ss06oowyqgXiKt5cI4ENSpnoFRgjoijVQzs5nex0L/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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