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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435dbc907085884b23c3110f317127c3d63d42a846dfef6c9da8633d467a7ea4' 
  AND token = 'rRfxSD2aJ8JkUIYDM3NuSFd5YdBs0P9slTxO1B/he+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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