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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd30aff2d9de63ea9d7cb54d120c8b3af7de4d8396ffecd664d9d9bd1e29b01d' 
  AND token = '20gwE3iHpuL2q0UajB6iwPN6u6hkHymA78PALFZlQkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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