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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5feeaf62d3849584765ed1f1c2ee7f5e4932b22479de32c1add8287f2aa1da18' 
  AND token = '4AnmjEhr2QWIjgdxZu94EyIlzgv+vTDR+za5JXQ2sjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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