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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeee116aa532111dc66596b9f3b9315d69f8b90d6b2cc8366a991560c453701e' 
  AND token = 'X5VPEz8XMmgIg2imY4XzAayzy38yj0M5Ns58CWSGuKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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