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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f4ae5d5e871f2c5d309b4455e155b61f6031f95fef9ca32c0a9739a8cf1c64' 
  AND token = 'UL28ctgMQklTWBEB+GjUQNiu2Q4Qz09gMjUckkQ0e1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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