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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acde40a60d1f6b19a3afd86a0e8647bbd4ad77464e4ee6bbe40c0d4a5d0fe13d' 
  AND token = 'qF2ihmyweqfdzCsKH9eUsOgl90XkXymQIqvM0KQs4UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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