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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4897c6468079b275ec8f84f0bb9c6e40c8c04f6ff116fa8f75e1f4085f45af70' 
  AND token = '+jHpGiOKq77ie568PjHiFh7p2GRPSe4II8/HMzcra5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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