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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c375babfb487b34ea345c740392b2e0be99886d9f95ac42f0ff573ed08bc0c33' 
  AND token = 'DZZ4/Sy8dhIuDADoctNHFe3nZO6ffFNExVVHgWJTZHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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