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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfcdb235b77e9037746b72549e3d9ea9603a87f26d9442ac99d72ed894200d0' 
  AND token = 'F11j/Qp4AsRUZU/GDh21uLaGIScmfW3ll0EQwG/lagc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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