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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbba37b2c9eb97917c3f24dadd3852a781ab7e026af93c58c387e050695a94fc' 
  AND token = 'T4nEhln+C/Ufap+01gFkokjpsR1GMvKMt4y1HDP62Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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