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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eff55eb270b4ac8caf142f32da4fa93820f7ea96839ca5e2f2827585d2f9923' 
  AND token = '4/GJfO9c/CqspD64eklhvjZ6Us084g7PjQttpFXD4r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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