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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3436b759348dfc8523b2320793979eba3cb221649fd9839ef3bce2296f03cfea' 
  AND token = 'X/GbxS9AwgkGfouow1J8RUZO/GnGU0ABKodGqX7hUXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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