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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85914a04deae2fff1e8842616dff243db14c5c50de5a5a231c22d0e8715fbe9' 
  AND token = 'dkVshwm24hmMC8pZJCB5r2FQP0X4oFJy2A1Lm3TWbgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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