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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b965884dbcd88568daa88cd75f3f985e246e0955c9631c622458ca249ace04b' 
  AND token = 'b4rKYO7W6dw6nkT9lOB1CGH7LySOMPF0AKOWSYNrzGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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