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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0a42a289198c4e68dbfe0a1883ec6937cf4371d2a657f29558d47e10f8b8ef' 
  AND token = 'QKN7Fh04eWUR6P3JClkZjlRVoLAn412jskUY0IntIzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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