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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413016308fd4c1b4379b418f9b5017ac45c1b0ffcab341661611d60e024d53e3' 
  AND token = 'cRPmzuz+Zs+VWo80pGpZyR+Dw9wXm+OO5fXeTNINEpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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