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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbb6de2d0f2f407ba792acc421d631399c37fe23634f0a352a1eb5dacb4c83b' 
  AND token = 'eyJOc9sgwAdy6UE/62FrX62iQDedqxhJV0cMcRLIeD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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